Canon EOS 77D Instruction Manual page 304

3 Shooting Video Snapshots
Shooting duration
304
Select [Album settings].
4
Select [Create a new album].
5
Select the snapshot length.
6
Press <0> and use the <W> <X>

keys to select the snapshot's length,
then press <0>.
Select [OK].
7
Press the <M> button to exit the

menu.

A blue bar will appear to indicate the
snapshot length.
Go to "Creating a Video Snapshot

Album" (p.305).